HealthSource Rhode Island reported that 22,033 residents have enrolled and paid their January premiums as of the Dec. 31 deadline — down from 27,060 a year earlier, according to data HealthSource RI released Wednesday.

A national report by Kaiser Health News in mid-December said Rhode Island’s enrollments had dropped 13.6 percent from a year ago. The drop was based on preliminary data for Rhode Island, which has a later deadline for enrollment than in most other states.

HealthSource RI said in a statement that the “main driver” of the enrollment decline was the departure from the market of UnitedHealthcare, which HealthSource RI estimated insured roughly 1,400 exchange customers in 2016.

About 26 percent of the people who enrolled in coverage failed to meet the Dec. 31 deadline for paying their premiums to start coverage January 1. Those 7,859 residents now have until Jan. 23 to pay their premiums to begin coverage on Feb. 1, Kyrie Perry, a spokeswoman for HealthSource RI, said.